SmartShunt showing 100% when battery is not fully charged

DIY
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1

Hello :wave:
Have you adjusted anything yet …

The ‘Charged Voltage’ voltage of the shunt is not correct … The voltage that the battery has when it is charged should be entered here.
That’s why the shunt is already at 100% and will certainly also inform the Mppt of this via the SmartNetwork …

2

Hey you🙂 I have followed the settings in the smart shut manual for the lithium battery. The only thing that I couldn’t change was the tail current. I don’t know how to do that.

3

When the battery has reached the required charging voltage and must have held it for a while for balancing to take place, the ‘tail current’ drops to a small value … because there is simply nothing more to fit into the cells … this is the value and the time you need to enter here.
You can only do this using the manufacturer’s data or by testing and observing.

Maybe take a look …

4

I thought we had been through this, the FAQ is the best advice for the charged voltage, set it to 0.2V below your absorption voltage. Setting it to 13.2V is below your battery voltage so every time it sees low current it syncs to 100%. Read the FAQ and it explains how sync works and why it needs to be higher.

https://community.victronenergy.com/t/shunt-battery-monitor-jumping-to-100-or-reporting-a-high-soc-when-the-volts-are-low-and-or-the-bms-has-disconnected/88

5

Kinda same help needs here. I am stucked on 13.35-13.4V for 2 days now. SOC says it’s on 100% but the battery came with 14.1V when I installed it into my system and it seems it will never reach again that voltage.
Some screenshots…maybe I just not patient enough or maybe someone will spot what’s the problem.

Screenshot_20241101_184040_com.victronenergy.victronconnect
Screenshot_20241101_184040_com.victronenergy.victronconnect1080×2340 174 KB

Screenshot_20241102_075759_com.victronenergy.victronconnect
Screenshot_20241102_075759_com.victronenergy.victronconnect1080×2340 192 KB

IMG_20241102_075559
IMG_20241102_0755591920×2560 186 KB

IMG_20241102_075628
IMG_20241102_0756281920×2560 162 KB

6

You mean a charger like blue smart 12/30?:thinking:

7

Still don’t understand. Not a single word. Never mind. @Netrange will take a little time to teach me.

8

Just set it to 14.2V for charged voltage. It will work.

9

Smart shunt setting, battery setting, charged voltage setting, 13.2V to 14.2V?

10

Solar charge.
From previous discussion your battery spec had an absorption voltage of 14.4V. You currently have 14.2V because you have chosen the default setting for Victron batteries. Press the expert button then you can increase this to 14.4V.

SmartShunt
Charged Voltage should be 14.2V. This is not per the Victron manual because the setting in Victron manual gets confused by solar charging as explained in the FAQ.

Tail current should be 2% but 4% will work equally well for lithium.

11

Solar charge, battery setting, absorbstion voltage set to 14.4V :arrow_right: Done.
Float voltage can stay on 13.5V?

Smart Shunt:
Battery settings, charged voltage: 13.2V to 14.2V :arrow_right: Done
Tail current: set to 2% :arrow_right: Done

12

13.5 is a perfectly safe voltage for lithium float. It may allow the battery to discharge a bit, perhaps 90% rather than keeping it totally full. See how it works, if once it goes to float all current comes from the battery and the battery discharges below 90% increase it a bit.

13

Thank you for your help.:wink: Will read again and again your comments until I will undertand. Because I guess I need to understand what I am doing if I want to keep the system and the battery in healthy state.